Wind turbine



FIG. 1 is an enlarged rear elevation view of a wind turbine showing our new design with the vanes and pole shown broken away for ease of illustration;

FIG. 2 is a top plan view thereof;

FIG. 3 is a left side elevation view thereof;

FIG. 4 is a left side perspective view thereof; and,

FIG. 5 is another left side perspective view thereof, with the vanes and pole shown in a complete configuration.

The broken lines shown represent unclaimed subject matter and form no part of the claimed design. 

The ornamental design for a wind turbine, as shown and described. 